Outbound Mail Scanning

Last updated on 2022-05-02 15:50:04

Important
Before using the Email Gateway Defense outbound filter, go to http://barracudacentral.org/lookups and verify that your outbound IP address is not on the Barracuda Reputation list. If present on the list, contact Barracuda Networks Technical Support and request removal before using the outbound service.

Table 1. Outbound Mail Settings

Feature	Description
Outbound Mail Scanning	All messages, inbound and outbound, routed through Email Gateway Defense are subject to a 300MB size limit. This includes all headers, body, and attached content. This size can be lowered on a per domain basis by contacting Barracuda Networks Technical Support. Outbound mail scanning includes: Spam Scanning with Block or Quarantine actions Virus Scanning IP Address Filtering Sender Domain, Username or Email Address Filtering Recipient Email Address Filtering Content Filtering (Subject, Header and Body) with Block, Allow, Quarantine, Encrypt, or Do not encrypt actions Attachment Filtering Intent Analysis The following tools are not applied to outbound mail: IP Reputation, a sender authentication mechanism Sender Policy Framework (SPF), a sender authentication mechanism DomainKeys (DKIM) inspection Exempt/block list See also: Outbound Quarantine
Outbound Mail Encryption	To prevent data leakage and ensure compliance with financial, healthcare, and other federally regulated agency information policies, you can require all email sent from any or all configured domains to be encrypted by configuring outbound mail encryption policies on the Outbound Settings > Content Policies page at the domain level. Inbound and outbound email transmission can also be required over a TLS channel. See also: How to Use DLP and Outbound Mail Encryption Secured Message Transmission
Outbound Message Footer	You can configure Email Gateway Defense to append a custom text and/or html footer to each outbound message at the global level on the Outbound Settings > Tagline/Footer page. Appending a footer to outbound messages will cause outbound messages to fail a DKIM check, affecting mail delivery for recipients who check for DKIM.

Feature

Description

Outbound Mail Scanning

All messages, inbound and outbound, routed through Email Gateway Defense are subject to a 300MB size limit. This includes all headers, body, and attached content. This size can be lowered on a per domain basis by contacting Barracuda Networks Technical Support.

Outbound mail scanning includes:

Spam Scanning with Block or Quarantine actions
Virus Scanning
IP Address Filtering
Sender Domain, Username or Email Address Filtering
Recipient Email Address Filtering
Content Filtering (Subject, Header and Body) with Block, Allow, Quarantine, Encrypt, or Do not encrypt actions
Attachment Filtering
Intent Analysis

The following tools are not applied to outbound mail:

IP Reputation, a sender authentication mechanism
Sender Policy Framework (SPF), a sender authentication mechanism
DomainKeys (DKIM) inspection
Exempt/block list

See also:

Outbound Quarantine

Outbound Mail Encryption

To prevent data leakage and ensure compliance with financial, healthcare, and other federally regulated agency information policies, you can require all email sent from any or all configured domains to be encrypted by configuring outbound mail encryption policies on the Outbound Settings > Content Policies page at the domain level.

Inbound and outbound email transmission can also be required over a TLS channel.

See also:

Outbound Message Footer

You can configure Email Gateway Defense to append a custom text and/or html footer to each outbound message at the global level on the Outbound Settings > Tagline/Footer page.

Appending a footer to outbound messages will cause outbound messages to fail a DKIM check, affecting mail delivery for recipients who check for DKIM.